Lock-nut for eyeglasses.



No. 770,029. PATENTED SEPT. 18, 1904.

W. F. TODD.

LOCK NUT FOR EYEGLASSES.

APPLICATION FILED MAR. 25, 1904.

N0 MODEL.

WITNESSES Ifi/VEWTOR 27 W QM M @y m e/b FM:

UNTTEn STaTEs Patented September 13, 1904.

WVILLIAM F. TODD, OF PONTIAC, MICHIGAN.

LOCK-NUT FOR EYEGLASSES.

SPECIFICATION forming part of Letters Patent No. 770,029, dated September 13, 1904.

Application filed March 25, 1904.

To all whont it may concern:

Be it known that LVVILLIAM F. TODD, a citizen of the United States, residing at Pontiac, county of Oakland, State of Michigan, have invented a certain new and useful Improvement in Lock-Nuts for Eyeglasses; and I declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

This invention relates to lock-nuts for eyeglass-frames, and has for its object an improved locking device to secure the screw by which the nose springand guard of an eyeglass-frame is secured to the arm which holds the lens and which will prevent the screw from turning and becoming loose.

In the drawings, Figure 1 is a perspective of the device. Figure 2 is a cross-section on an enlarged scale. Fig. 8 shows the lockingwasher.

1 indicates the bracket on the frame 2 of the eyeglass, made with a groove or channel in which the end of the bow 3 engages. The groove or channel is deeper than the combined thickness of the bow-piece 3 and the branch of the nose-guard 10, which engages in the grooves, and in the assembled structure there is still a depression or groove between the walls 5 and 6 and above the surface of the arm of the nose-guard. The lock is made of a single piece of slightly-resilient material bent to an angle shape, with a screw-hole 4: through one branch of the angled piece and with the second branch adapted to engage closely against the outside of the bracket 1, with that branch through which the hole is made extending across the bracket over the wall 5 of the frame, but so short as to engage on the nose-piece 3 and stopping short of the wall 6. The hole 4 in the first instance registers with the holes 7 and 8 through the nosepiece and through the frame-bracket; but as the screw is driven home that branch of the lock which extends across the nose-piece bends slightly under the force of the screw and causes Serial No. 199,892. (No model.)

the edge of the lock to bind strongly against the stem of the screw, causing the branch 9 of the lock to engage strongly against the side of the bracket.

The metal, while of a soft and yielding charactor, is slightly resilient and holds the screw under a constant strain. Nevertheless the strain of the angled lock on the bracket is sufficient to prevent the one piece working with respect to the other, although the nose-piece may work slightly in its seat on the bracket, and the screw is held securely against any tendency to work-out from its engagement.

I/Vhat I claim is- 1. In a nut-lock for eyeglasses, in combination with a channeled bracket provided with means for holdingthe lens of said eyeglass, a

nose-bow and a guard arranged to rest therein, and having a combined thickness therein less than the depth of the'channel in said bracket, an angled locking-piece provided with a flange to engage over a wall of the channel and with a perforated branch to extend across said groove but of a length to stop short of the opposite wall thereof, the said perforation being in alinement with the screw-hole of said bracket, whereby under the strain of the screw the said locking-piece bends toward the nose-guard and causes the locking-piece to bind against the stem of the screw and against the side of the bracket, substantially as described.

2. In a locking-nut for eyeglasses, in combination with a channeled bracket in the channel of which the nose-bow and the nose-guard engage, an angled locking member having a branch which engages against the side of the bracket and a branch which extends across the channel of the bracket and is bent by the securing-screw and caused to bind against the screw and the bracket, substantially as described.

In testimony whereof I sign this specification in the presence of two witnesses.

WILLIAM F. TODD.

Witnesses:

' MAY E. KoTT,

LoTTA LEE HAYTON. 

